"This would cause a global catastrophe wherever it hit the Earth, via a climate change, and this would lead to a rapid cut-off of the food supply and ultimately within a few months to a loss of probably a quarter of the world's population, " he told BBC radio.
But Syria could certainly cut off the flow of re-supply to Hezbollah, which eventually would be felt, and Hezbollah could not ignore that if Syria took that step.
The way you do that is you cut off their bolt-hole so that there's nowhere that they can hide, and you cut off their sources ofsupply, both of money and of arms, and that has, that is going to be an ongoing operation.